The car industry was slow to react to the iPod revolution. But with maker Apple selling more than 30 million of its MP3 players, the big names in the in-car entertainment business now realise that, as with cassettes, the CD's motoring days are numbered.

So, drivers wanting to play digital music through their stereo have lots of options. Budget buyers can choose from a range of FM transmitters (as tested in Issue 950), although signal interference is often a problem. A replacement head unit cures this, and some let you control your iPod.

The market is now so biased towards the iPod that one of the nine set-ups we tested has no cassette or CD player - just a radio tuner and MP3 capability.